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Devil Book

n. `The Design and Implementation of the 4.3BSD
UNIX Operating System', by Samuel J. Leffler, Marshall Kirk
McKusick, Michael J. Karels, and John S. Quarterman (Addison-Wesley
Publishers, 1989) --- the standard reference book on the internals
of BSD UNIX. So called because the cover has a picture
depicting a little devil (a visual play on daemon) in
sneakers, holding a pitchfork (referring to one of the
characteristic features of UNIX, the `fork(2)' system call).